On the commodities front, Oil (NYSEARCA:USO) dropped to $91.70 a barrel. Precious metals were mixed, with Gold (NYSEARCA:GLD) rising to $1,772.60 per ounce, and Silver (NYSEARCA:SLV) falling 0.32% to $34.53.

Here’s your Cheat Sheet to today’s top stock stories:

Apple (NASDAQ:AAPL) has released its much-awaited new mobile operating system that was first announced at the company’s developers’ conference in June and adds over 200 new features. Apple is making the update available to existing users of its mobile devices in a staggered release on Wednesday. The new software is compatible with the iPhone 3GS, iPhone 4, iPhone 4S, the iPad 2, the new iPad, and the fourth- and fifth-generation iPod touch.

Harvey Schwartz will take over the role of chief financial officer at Goldman Sachs (NYSE:GS) in January. He will be filling a spot vacated by David Viniar, who is the longest-serving chief financial officer on Wall Street, and has been with Goldman since its IPO in 1999.

In a statement released this morning, investment firm Blackstone Group (NYSE:BX) announced it will purchase one of the largest providers of home security services in North America, Vivint, for $2 billion. A fund managed by the New-York based investment firm will acquire Vivint from its shareholders, Goldman Sachs, Peterson Partners, and Jupiter Partners, on behalf of its equity investors. After the deal closes, Blackstone will own more than 50 percent of the company.

S&P 500 (NYSEARCA:SPY) component General Mills Inc. (NYSE:GIS) reported its results for the first quarter. General Mills is a manufacturer and marketer of branded consumer foods sold through retail stores. It also supplies branded and unbranded food products to the food service and commercial baking industries. See our General Mills Earnings Cheat Sheet.